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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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![Linus Torvalds](/assets/img/avatar_default.png)
Core changes: - Some core changes are already in outside of this pull request as they came through the regulator tree, most notably devm_gpiod_unhinge() that removes devres refcount management from a GPIO descriptor. This is needed in subsystems such as regulators where the regulator core need to take over the reference counting and lifecycle management for a GPIO descriptor. - We dropped devm_gpiochip_remove() and devm_gpio_chip_match() as nothing needs it. We can bring it back if need be. - Add a global TODO so people see where we are going. This helps setting the direction now that we are two GPIO maintainers. - Handle the MMC CD/WP properties in the device tree core. (The bulk of patches activating this code is already merged through the MMC/SD tree.) - Augment gpiochip_request_own_desc() to pass a flag so we as gpiochips can request lines as active low or open drain etc even from ourselves. New drivers: - New driver for Cadence GPIO blocks. - New driver for Atmel SAMA5D2 PIOBU GPIO lines. Driver improvements: - A major refactoring of the PCA953x driver - this driver has been around for ages, and is now modernized to reduce code duplication that has stacked up and is using regmap to read write and cache registers. - Intel drivers are now maintained in a separate tree and start with a round of cleanups and unifications. -----BEGIN PGP SIGNATURE----- iQIcBAABAgAGBQJcJJcmAAoJEEEQszewGV1zdCoQAMSLPh+4QdYLFS3ZmnsPvZkg Zkz94RVT+uLLmHpR8XBl0wl4mmYCiwB50IwsXwlvJGceSXjCn6hLg9BZBP5hFMCb yFk3fgXQSh7TOnpjgbCWSssCjpejQ0cOb/2nWHz5s/fbYKYlh3VXckW9hhW+R+b3 6+Mno1SzmBkpVVQ21ISlZeLoNDynkCW6DfjiKMuHAyxzxa0oZ9Qid+tnVDnQM4rD rCnvYLuvxlXw97W+LI7AU9KoCITdO+2M/0dtGVEEYKfHseRReSy2Oo3nlqCglygX cNkBe9RYU1CJdas1P/c18wjDAqWp/pbugzHDkYF5Y3tBtB2rQSftjtnQngiVMXMt De7ejPvL7/OLECvI2WUD6y9NAduw/HE4FO8BBdn0gP/a9svJpVZ993yPd3F9n7EZ ZIBpycDZVtkcE7dwQgek17bFILRY5nBBMB9oCLL2wk48qdmjpcAbxVfGSsYOe6wO +cZRZuj/eR3i9gHRugfFx7Evoc7l4erihTpES/YAy3De1s3uV8KjT4zE7Jh+M9LW GM797BcXJJeb5toC7HZ/G2UAVMyWEhY0n7PGG616CS8IrzmzIZpJOL9kUVOWPb0F 9CPt6qhVbUl9rxp1H/Z3TxvYqIw6icn/z5YewZxLU1zaBlpE3jc7PhZb5hOGnFUf /DWwe4n99JsjHTrGx1ra =05LW -----END PGP SIGNATURE----- Merge tag 'gpio-v4.21-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio Pull GPIO updates from Linus Walleij: "This is the bulk of GPIO changes for the v4.21 kernel series. Core changes: - Some core changes are already in outside of this pull request as they came through the regulator tree, most notably devm_gpiod_unhinge() that removes devres refcount management from a GPIO descriptor. This is needed in subsystems such as regulators where the regulator core need to take over the reference counting and lifecycle management for a GPIO descriptor. - We dropped devm_gpiochip_remove() and devm_gpio_chip_match() as nothing needs it. We can bring it back if need be. - Add a global TODO so people see where we are going. This helps setting the direction now that we are two GPIO maintainers. - Handle the MMC CD/WP properties in the device tree core. (The bulk of patches activating this code is already merged through the MMC/SD tree.) - Augment gpiochip_request_own_desc() to pass a flag so we as gpiochips can request lines as active low or open drain etc even from ourselves. New drivers: - New driver for Cadence GPIO blocks. - New driver for Atmel SAMA5D2 PIOBU GPIO lines. Driver improvements: - A major refactoring of the PCA953x driver - this driver has been around for ages, and is now modernized to reduce code duplication that has stacked up and is using regmap to read write and cache registers. - Intel drivers are now maintained in a separate tree and start with a round of cleanups and unifications" * tag 'gpio-v4.21-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio: (99 commits) gpio: sama5d2-piobu: Depend on OF_GPIO gpio: Add Cadence GPIO driver dt-bindings: gpio: Add bindings for Cadence GPIO gpiolib-acpi: remove unused variable 'err', cleans up build warning gpio: mxs: read pin level directly instead of using .get gpio: aspeed: remove duplicated statement gpio: add driver for SAMA5D2 PIOBU pins dt-bindings: arm: atmel: describe SECUMOD usage as a GPIO controller gpio/mmc/of: Respect polarity in the device tree dt-bindings: gpio: rcar: Add r8a774c0 (RZ/G2E) support memory: omap-gpmc: Get the header of the enum ARM: omap1: Fix new user of gpiochip_request_own_desc() gpio: pca953x: Add regmap dependency for PCA953x driver gpio: raspberrypi-exp: decrease refcount on firmware dt node gpiolib: Fix return value of gpio_to_desc() stub if !GPIOLIB gpio: pca953x: Restore registers after suspend/resume cycle gpio: pca953x: Zap single use of pca953x_read_single() gpio: pca953x: Zap ad-hoc reg_output cache gpio: pca953x: Zap ad-hoc reg_direction cache gpio: pca953x: Perform basic regmap conversion ...
1243 lines
31 KiB
C
1243 lines
31 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* ACPI helpers for GPIO API
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*
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* Copyright (C) 2012, Intel Corporation
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* Authors: Mathias Nyman <mathias.nyman@linux.intel.com>
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* Mika Westerberg <mika.westerberg@linux.intel.com>
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*/
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#include <linux/errno.h>
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#include <linux/gpio/consumer.h>
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#include <linux/gpio/driver.h>
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#include <linux/gpio/machine.h>
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#include <linux/export.h>
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#include <linux/acpi.h>
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#include <linux/interrupt.h>
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#include <linux/mutex.h>
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#include <linux/pinctrl/pinctrl.h>
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#include "gpiolib.h"
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/**
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* struct acpi_gpio_event - ACPI GPIO event handler data
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*
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* @node: list-entry of the events list of the struct acpi_gpio_chip
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* @handle: handle of ACPI method to execute when the IRQ triggers
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* @handler: irq_handler to pass to request_irq when requesting the IRQ
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* @pin: GPIO pin number on the gpio_chip
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* @irq: Linux IRQ number for the event, for request_ / free_irq
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* @irqflags: flags to pass to request_irq when requesting the IRQ
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* @irq_is_wake: If the ACPI flags indicate the IRQ is a wakeup source
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* @is_requested: True if request_irq has been done
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* @desc: gpio_desc for the GPIO pin for this event
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*/
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struct acpi_gpio_event {
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struct list_head node;
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acpi_handle handle;
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irq_handler_t handler;
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unsigned int pin;
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unsigned int irq;
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unsigned long irqflags;
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bool irq_is_wake;
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bool irq_requested;
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struct gpio_desc *desc;
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};
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struct acpi_gpio_connection {
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struct list_head node;
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unsigned int pin;
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struct gpio_desc *desc;
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};
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struct acpi_gpio_chip {
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/*
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* ACPICA requires that the first field of the context parameter
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* passed to acpi_install_address_space_handler() is large enough
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* to hold struct acpi_connection_info.
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*/
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struct acpi_connection_info conn_info;
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struct list_head conns;
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struct mutex conn_lock;
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struct gpio_chip *chip;
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struct list_head events;
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struct list_head deferred_req_irqs_list_entry;
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};
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/*
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* For gpiochips which call acpi_gpiochip_request_interrupts() before late_init
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* (so builtin drivers) we register the ACPI GpioInt IRQ handlers from a
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* late_initcall_sync handler, so that other builtin drivers can register their
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* OpRegions before the event handlers can run. This list contains gpiochips
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* for which the acpi_gpiochip_request_irqs() call has been deferred.
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*/
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static DEFINE_MUTEX(acpi_gpio_deferred_req_irqs_lock);
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static LIST_HEAD(acpi_gpio_deferred_req_irqs_list);
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static bool acpi_gpio_deferred_req_irqs_done;
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static int acpi_gpiochip_find(struct gpio_chip *gc, void *data)
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{
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if (!gc->parent)
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return false;
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return ACPI_HANDLE(gc->parent) == data;
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}
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/**
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* acpi_get_gpiod() - Translate ACPI GPIO pin to GPIO descriptor usable with GPIO API
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* @path: ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1")
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* @pin: ACPI GPIO pin number (0-based, controller-relative)
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*
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* Return: GPIO descriptor to use with Linux generic GPIO API, or ERR_PTR
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* error value. Specifically returns %-EPROBE_DEFER if the referenced GPIO
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* controller does not have gpiochip registered at the moment. This is to
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* support probe deferral.
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*/
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static struct gpio_desc *acpi_get_gpiod(char *path, int pin)
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{
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struct gpio_chip *chip;
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acpi_handle handle;
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acpi_status status;
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status = acpi_get_handle(NULL, path, &handle);
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if (ACPI_FAILURE(status))
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return ERR_PTR(-ENODEV);
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chip = gpiochip_find(handle, acpi_gpiochip_find);
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if (!chip)
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return ERR_PTR(-EPROBE_DEFER);
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return gpiochip_get_desc(chip, pin);
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}
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static irqreturn_t acpi_gpio_irq_handler(int irq, void *data)
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{
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struct acpi_gpio_event *event = data;
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acpi_evaluate_object(event->handle, NULL, NULL, NULL);
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return IRQ_HANDLED;
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}
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static irqreturn_t acpi_gpio_irq_handler_evt(int irq, void *data)
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{
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struct acpi_gpio_event *event = data;
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acpi_execute_simple_method(event->handle, NULL, event->pin);
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return IRQ_HANDLED;
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}
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static void acpi_gpio_chip_dh(acpi_handle handle, void *data)
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{
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/* The address of this function is used as a key. */
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}
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bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
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struct acpi_resource_gpio **agpio)
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{
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struct acpi_resource_gpio *gpio;
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if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
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return false;
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gpio = &ares->data.gpio;
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if (gpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_INT)
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return false;
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*agpio = gpio;
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return true;
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}
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EXPORT_SYMBOL_GPL(acpi_gpio_get_irq_resource);
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static void acpi_gpiochip_request_irq(struct acpi_gpio_chip *acpi_gpio,
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struct acpi_gpio_event *event)
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{
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int ret, value;
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ret = request_threaded_irq(event->irq, NULL, event->handler,
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event->irqflags, "ACPI:Event", event);
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if (ret) {
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dev_err(acpi_gpio->chip->parent,
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"Failed to setup interrupt handler for %d\n",
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event->irq);
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return;
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}
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if (event->irq_is_wake)
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enable_irq_wake(event->irq);
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event->irq_requested = true;
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/* Make sure we trigger the initial state of edge-triggered IRQs */
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value = gpiod_get_raw_value_cansleep(event->desc);
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if (((event->irqflags & IRQF_TRIGGER_RISING) && value == 1) ||
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((event->irqflags & IRQF_TRIGGER_FALLING) && value == 0))
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event->handler(event->irq, event);
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}
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static void acpi_gpiochip_request_irqs(struct acpi_gpio_chip *acpi_gpio)
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{
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struct acpi_gpio_event *event;
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list_for_each_entry(event, &acpi_gpio->events, node)
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acpi_gpiochip_request_irq(acpi_gpio, event);
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}
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static acpi_status acpi_gpiochip_alloc_event(struct acpi_resource *ares,
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void *context)
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{
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struct acpi_gpio_chip *acpi_gpio = context;
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struct gpio_chip *chip = acpi_gpio->chip;
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struct acpi_resource_gpio *agpio;
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acpi_handle handle, evt_handle;
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struct acpi_gpio_event *event;
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irq_handler_t handler = NULL;
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struct gpio_desc *desc;
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int ret, pin, irq;
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if (!acpi_gpio_get_irq_resource(ares, &agpio))
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return AE_OK;
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handle = ACPI_HANDLE(chip->parent);
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pin = agpio->pin_table[0];
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if (pin <= 255) {
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char ev_name[5];
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sprintf(ev_name, "_%c%02hhX",
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agpio->triggering == ACPI_EDGE_SENSITIVE ? 'E' : 'L',
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pin);
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if (ACPI_SUCCESS(acpi_get_handle(handle, ev_name, &evt_handle)))
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handler = acpi_gpio_irq_handler;
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}
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if (!handler) {
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if (ACPI_SUCCESS(acpi_get_handle(handle, "_EVT", &evt_handle)))
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handler = acpi_gpio_irq_handler_evt;
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}
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if (!handler)
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return AE_OK;
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desc = gpiochip_request_own_desc(chip, pin, "ACPI:Event", 0);
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if (IS_ERR(desc)) {
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dev_err(chip->parent, "Failed to request GPIO\n");
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return AE_ERROR;
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}
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gpiod_direction_input(desc);
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ret = gpiochip_lock_as_irq(chip, pin);
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if (ret) {
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dev_err(chip->parent, "Failed to lock GPIO as interrupt\n");
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goto fail_free_desc;
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}
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irq = gpiod_to_irq(desc);
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if (irq < 0) {
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dev_err(chip->parent, "Failed to translate GPIO to IRQ\n");
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goto fail_unlock_irq;
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}
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event = kzalloc(sizeof(*event), GFP_KERNEL);
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if (!event)
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goto fail_unlock_irq;
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event->irqflags = IRQF_ONESHOT;
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if (agpio->triggering == ACPI_LEVEL_SENSITIVE) {
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if (agpio->polarity == ACPI_ACTIVE_HIGH)
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event->irqflags |= IRQF_TRIGGER_HIGH;
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else
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event->irqflags |= IRQF_TRIGGER_LOW;
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} else {
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switch (agpio->polarity) {
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case ACPI_ACTIVE_HIGH:
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event->irqflags |= IRQF_TRIGGER_RISING;
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break;
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case ACPI_ACTIVE_LOW:
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event->irqflags |= IRQF_TRIGGER_FALLING;
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break;
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default:
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event->irqflags |= IRQF_TRIGGER_RISING |
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IRQF_TRIGGER_FALLING;
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break;
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}
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}
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event->handle = evt_handle;
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event->handler = handler;
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event->irq = irq;
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event->irq_is_wake = agpio->wake_capable == ACPI_WAKE_CAPABLE;
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event->pin = pin;
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event->desc = desc;
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list_add_tail(&event->node, &acpi_gpio->events);
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return AE_OK;
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fail_unlock_irq:
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gpiochip_unlock_as_irq(chip, pin);
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fail_free_desc:
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gpiochip_free_own_desc(desc);
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return AE_ERROR;
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}
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/**
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* acpi_gpiochip_request_interrupts() - Register isr for gpio chip ACPI events
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* @chip: GPIO chip
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*
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* ACPI5 platforms can use GPIO signaled ACPI events. These GPIO interrupts are
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* handled by ACPI event methods which need to be called from the GPIO
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* chip's interrupt handler. acpi_gpiochip_request_interrupts finds out which
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* gpio pins have acpi event methods and assigns interrupt handlers that calls
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* the acpi event methods for those pins.
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*/
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void acpi_gpiochip_request_interrupts(struct gpio_chip *chip)
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{
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struct acpi_gpio_chip *acpi_gpio;
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acpi_handle handle;
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acpi_status status;
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bool defer;
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if (!chip->parent || !chip->to_irq)
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return;
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handle = ACPI_HANDLE(chip->parent);
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if (!handle)
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return;
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status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
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if (ACPI_FAILURE(status))
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return;
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acpi_walk_resources(handle, "_AEI",
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acpi_gpiochip_alloc_event, acpi_gpio);
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mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
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defer = !acpi_gpio_deferred_req_irqs_done;
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if (defer)
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list_add(&acpi_gpio->deferred_req_irqs_list_entry,
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&acpi_gpio_deferred_req_irqs_list);
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mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);
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if (defer)
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return;
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acpi_gpiochip_request_irqs(acpi_gpio);
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}
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EXPORT_SYMBOL_GPL(acpi_gpiochip_request_interrupts);
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/**
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* acpi_gpiochip_free_interrupts() - Free GPIO ACPI event interrupts.
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* @chip: GPIO chip
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*
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* Free interrupts associated with GPIO ACPI event method for the given
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* GPIO chip.
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*/
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void acpi_gpiochip_free_interrupts(struct gpio_chip *chip)
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{
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struct acpi_gpio_chip *acpi_gpio;
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struct acpi_gpio_event *event, *ep;
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acpi_handle handle;
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acpi_status status;
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if (!chip->parent || !chip->to_irq)
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return;
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handle = ACPI_HANDLE(chip->parent);
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if (!handle)
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return;
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status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
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if (ACPI_FAILURE(status))
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return;
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mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
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if (!list_empty(&acpi_gpio->deferred_req_irqs_list_entry))
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list_del_init(&acpi_gpio->deferred_req_irqs_list_entry);
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mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);
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list_for_each_entry_safe_reverse(event, ep, &acpi_gpio->events, node) {
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struct gpio_desc *desc;
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if (event->irq_requested) {
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if (event->irq_is_wake)
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disable_irq_wake(event->irq);
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free_irq(event->irq, event);
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}
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desc = event->desc;
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if (WARN_ON(IS_ERR(desc)))
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continue;
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gpiochip_unlock_as_irq(chip, event->pin);
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gpiochip_free_own_desc(desc);
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list_del(&event->node);
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kfree(event);
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}
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}
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EXPORT_SYMBOL_GPL(acpi_gpiochip_free_interrupts);
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int acpi_dev_add_driver_gpios(struct acpi_device *adev,
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const struct acpi_gpio_mapping *gpios)
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{
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if (adev && gpios) {
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adev->driver_gpios = gpios;
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return 0;
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}
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return -EINVAL;
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}
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EXPORT_SYMBOL_GPL(acpi_dev_add_driver_gpios);
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static void devm_acpi_dev_release_driver_gpios(struct device *dev, void *res)
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{
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acpi_dev_remove_driver_gpios(ACPI_COMPANION(dev));
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}
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int devm_acpi_dev_add_driver_gpios(struct device *dev,
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const struct acpi_gpio_mapping *gpios)
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{
|
|
void *res;
|
|
int ret;
|
|
|
|
res = devres_alloc(devm_acpi_dev_release_driver_gpios, 0, GFP_KERNEL);
|
|
if (!res)
|
|
return -ENOMEM;
|
|
|
|
ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(dev), gpios);
|
|
if (ret) {
|
|
devres_free(res);
|
|
return ret;
|
|
}
|
|
devres_add(dev, res);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_acpi_dev_add_driver_gpios);
|
|
|
|
void devm_acpi_dev_remove_driver_gpios(struct device *dev)
|
|
{
|
|
WARN_ON(devres_release(dev, devm_acpi_dev_release_driver_gpios, NULL, NULL));
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_acpi_dev_remove_driver_gpios);
|
|
|
|
static bool acpi_get_driver_gpio_data(struct acpi_device *adev,
|
|
const char *name, int index,
|
|
struct fwnode_reference_args *args,
|
|
unsigned int *quirks)
|
|
{
|
|
const struct acpi_gpio_mapping *gm;
|
|
|
|
if (!adev->driver_gpios)
|
|
return false;
|
|
|
|
for (gm = adev->driver_gpios; gm->name; gm++)
|
|
if (!strcmp(name, gm->name) && gm->data && index < gm->size) {
|
|
const struct acpi_gpio_params *par = gm->data + index;
|
|
|
|
args->fwnode = acpi_fwnode_handle(adev);
|
|
args->args[0] = par->crs_entry_index;
|
|
args->args[1] = par->line_index;
|
|
args->args[2] = par->active_low;
|
|
args->nargs = 3;
|
|
|
|
*quirks = gm->quirks;
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static enum gpiod_flags
|
|
acpi_gpio_to_gpiod_flags(const struct acpi_resource_gpio *agpio)
|
|
{
|
|
bool pull_up = agpio->pin_config == ACPI_PIN_CONFIG_PULLUP;
|
|
|
|
switch (agpio->io_restriction) {
|
|
case ACPI_IO_RESTRICT_INPUT:
|
|
return GPIOD_IN;
|
|
case ACPI_IO_RESTRICT_OUTPUT:
|
|
/*
|
|
* ACPI GPIO resources don't contain an initial value for the
|
|
* GPIO. Therefore we deduce that value from the pull field
|
|
* instead. If the pin is pulled up we assume default to be
|
|
* high, otherwise low.
|
|
*/
|
|
return pull_up ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
|
|
default:
|
|
/*
|
|
* Assume that the BIOS has configured the direction and pull
|
|
* accordingly.
|
|
*/
|
|
return GPIOD_ASIS;
|
|
}
|
|
}
|
|
|
|
static int
|
|
__acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, enum gpiod_flags update)
|
|
{
|
|
int ret = 0;
|
|
|
|
/*
|
|
* Check if the BIOS has IoRestriction with explicitly set direction
|
|
* and update @flags accordingly. Otherwise use whatever caller asked
|
|
* for.
|
|
*/
|
|
if (update & GPIOD_FLAGS_BIT_DIR_SET) {
|
|
enum gpiod_flags diff = *flags ^ update;
|
|
|
|
/*
|
|
* Check if caller supplied incompatible GPIO initialization
|
|
* flags.
|
|
*
|
|
* Return %-EINVAL to notify that firmware has different
|
|
* settings and we are going to use them.
|
|
*/
|
|
if (((*flags & GPIOD_FLAGS_BIT_DIR_SET) && (diff & GPIOD_FLAGS_BIT_DIR_OUT)) ||
|
|
((*flags & GPIOD_FLAGS_BIT_DIR_OUT) && (diff & GPIOD_FLAGS_BIT_DIR_VAL)))
|
|
ret = -EINVAL;
|
|
*flags = update;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int
|
|
acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, struct acpi_gpio_info *info)
|
|
{
|
|
struct device *dev = &info->adev->dev;
|
|
enum gpiod_flags old = *flags;
|
|
int ret;
|
|
|
|
ret = __acpi_gpio_update_gpiod_flags(&old, info->flags);
|
|
if (info->quirks & ACPI_GPIO_QUIRK_NO_IO_RESTRICTION) {
|
|
if (ret)
|
|
dev_warn(dev, FW_BUG "GPIO not in correct mode, fixing\n");
|
|
} else {
|
|
if (ret)
|
|
dev_dbg(dev, "Override GPIO initialization flags\n");
|
|
*flags = old;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
struct acpi_gpio_lookup {
|
|
struct acpi_gpio_info info;
|
|
int index;
|
|
int pin_index;
|
|
bool active_low;
|
|
struct gpio_desc *desc;
|
|
int n;
|
|
};
|
|
|
|
static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data)
|
|
{
|
|
struct acpi_gpio_lookup *lookup = data;
|
|
|
|
if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
|
|
return 1;
|
|
|
|
if (lookup->n++ == lookup->index && !lookup->desc) {
|
|
const struct acpi_resource_gpio *agpio = &ares->data.gpio;
|
|
int pin_index = lookup->pin_index;
|
|
|
|
if (pin_index >= agpio->pin_table_length)
|
|
return 1;
|
|
|
|
lookup->desc = acpi_get_gpiod(agpio->resource_source.string_ptr,
|
|
agpio->pin_table[pin_index]);
|
|
lookup->info.gpioint =
|
|
agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT;
|
|
|
|
/*
|
|
* Polarity and triggering are only specified for GpioInt
|
|
* resource.
|
|
* Note: we expect here:
|
|
* - ACPI_ACTIVE_LOW == GPIO_ACTIVE_LOW
|
|
* - ACPI_ACTIVE_HIGH == GPIO_ACTIVE_HIGH
|
|
*/
|
|
if (lookup->info.gpioint) {
|
|
lookup->info.flags = GPIOD_IN;
|
|
lookup->info.polarity = agpio->polarity;
|
|
lookup->info.triggering = agpio->triggering;
|
|
} else {
|
|
lookup->info.flags = acpi_gpio_to_gpiod_flags(agpio);
|
|
lookup->info.polarity = lookup->active_low;
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int acpi_gpio_resource_lookup(struct acpi_gpio_lookup *lookup,
|
|
struct acpi_gpio_info *info)
|
|
{
|
|
struct acpi_device *adev = lookup->info.adev;
|
|
struct list_head res_list;
|
|
int ret;
|
|
|
|
INIT_LIST_HEAD(&res_list);
|
|
|
|
ret = acpi_dev_get_resources(adev, &res_list,
|
|
acpi_populate_gpio_lookup,
|
|
lookup);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
acpi_dev_free_resource_list(&res_list);
|
|
|
|
if (!lookup->desc)
|
|
return -ENOENT;
|
|
|
|
if (info)
|
|
*info = lookup->info;
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode,
|
|
const char *propname, int index,
|
|
struct acpi_gpio_lookup *lookup)
|
|
{
|
|
struct fwnode_reference_args args;
|
|
unsigned int quirks = 0;
|
|
int ret;
|
|
|
|
memset(&args, 0, sizeof(args));
|
|
ret = __acpi_node_get_property_reference(fwnode, propname, index, 3,
|
|
&args);
|
|
if (ret) {
|
|
struct acpi_device *adev = to_acpi_device_node(fwnode);
|
|
|
|
if (!adev)
|
|
return ret;
|
|
|
|
if (!acpi_get_driver_gpio_data(adev, propname, index, &args,
|
|
&quirks))
|
|
return ret;
|
|
}
|
|
/*
|
|
* The property was found and resolved, so need to lookup the GPIO based
|
|
* on returned args.
|
|
*/
|
|
if (!to_acpi_device_node(args.fwnode))
|
|
return -EINVAL;
|
|
if (args.nargs != 3)
|
|
return -EPROTO;
|
|
|
|
lookup->index = args.args[0];
|
|
lookup->pin_index = args.args[1];
|
|
lookup->active_low = !!args.args[2];
|
|
|
|
lookup->info.adev = to_acpi_device_node(args.fwnode);
|
|
lookup->info.quirks = quirks;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* acpi_get_gpiod_by_index() - get a GPIO descriptor from device resources
|
|
* @adev: pointer to a ACPI device to get GPIO from
|
|
* @propname: Property name of the GPIO (optional)
|
|
* @index: index of GpioIo/GpioInt resource (starting from %0)
|
|
* @info: info pointer to fill in (optional)
|
|
*
|
|
* Function goes through ACPI resources for @adev and based on @index looks
|
|
* up a GpioIo/GpioInt resource, translates it to the Linux GPIO descriptor,
|
|
* and returns it. @index matches GpioIo/GpioInt resources only so if there
|
|
* are total %3 GPIO resources, the index goes from %0 to %2.
|
|
*
|
|
* If @propname is specified the GPIO is looked using device property. In
|
|
* that case @index is used to select the GPIO entry in the property value
|
|
* (in case of multiple).
|
|
*
|
|
* If the GPIO cannot be translated or there is an error an ERR_PTR is
|
|
* returned.
|
|
*
|
|
* Note: if the GPIO resource has multiple entries in the pin list, this
|
|
* function only returns the first.
|
|
*/
|
|
static struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev,
|
|
const char *propname, int index,
|
|
struct acpi_gpio_info *info)
|
|
{
|
|
struct acpi_gpio_lookup lookup;
|
|
int ret;
|
|
|
|
if (!adev)
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
memset(&lookup, 0, sizeof(lookup));
|
|
lookup.index = index;
|
|
|
|
if (propname) {
|
|
dev_dbg(&adev->dev, "GPIO: looking up %s\n", propname);
|
|
|
|
ret = acpi_gpio_property_lookup(acpi_fwnode_handle(adev),
|
|
propname, index, &lookup);
|
|
if (ret)
|
|
return ERR_PTR(ret);
|
|
|
|
dev_dbg(&adev->dev, "GPIO: _DSD returned %s %d %d %u\n",
|
|
dev_name(&lookup.info.adev->dev), lookup.index,
|
|
lookup.pin_index, lookup.active_low);
|
|
} else {
|
|
dev_dbg(&adev->dev, "GPIO: looking up %d in _CRS\n", index);
|
|
lookup.info.adev = adev;
|
|
}
|
|
|
|
ret = acpi_gpio_resource_lookup(&lookup, info);
|
|
return ret ? ERR_PTR(ret) : lookup.desc;
|
|
}
|
|
|
|
struct gpio_desc *acpi_find_gpio(struct device *dev,
|
|
const char *con_id,
|
|
unsigned int idx,
|
|
enum gpiod_flags *dflags,
|
|
enum gpio_lookup_flags *lookupflags)
|
|
{
|
|
struct acpi_device *adev = ACPI_COMPANION(dev);
|
|
struct acpi_gpio_info info;
|
|
struct gpio_desc *desc;
|
|
char propname[32];
|
|
int i;
|
|
|
|
/* Try first from _DSD */
|
|
for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
|
|
if (con_id) {
|
|
snprintf(propname, sizeof(propname), "%s-%s",
|
|
con_id, gpio_suffixes[i]);
|
|
} else {
|
|
snprintf(propname, sizeof(propname), "%s",
|
|
gpio_suffixes[i]);
|
|
}
|
|
|
|
desc = acpi_get_gpiod_by_index(adev, propname, idx, &info);
|
|
if (!IS_ERR(desc))
|
|
break;
|
|
if (PTR_ERR(desc) == -EPROBE_DEFER)
|
|
return ERR_CAST(desc);
|
|
}
|
|
|
|
/* Then from plain _CRS GPIOs */
|
|
if (IS_ERR(desc)) {
|
|
if (!acpi_can_fallback_to_crs(adev, con_id))
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
desc = acpi_get_gpiod_by_index(adev, NULL, idx, &info);
|
|
if (IS_ERR(desc))
|
|
return desc;
|
|
}
|
|
|
|
if (info.gpioint &&
|
|
(*dflags == GPIOD_OUT_LOW || *dflags == GPIOD_OUT_HIGH)) {
|
|
dev_dbg(dev, "refusing GpioInt() entry when doing GPIOD_OUT_* lookup\n");
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
|
|
if (info.polarity == GPIO_ACTIVE_LOW)
|
|
*lookupflags |= GPIO_ACTIVE_LOW;
|
|
|
|
acpi_gpio_update_gpiod_flags(dflags, &info);
|
|
return desc;
|
|
}
|
|
|
|
/**
|
|
* acpi_node_get_gpiod() - get a GPIO descriptor from ACPI resources
|
|
* @fwnode: pointer to an ACPI firmware node to get the GPIO information from
|
|
* @propname: Property name of the GPIO
|
|
* @index: index of GpioIo/GpioInt resource (starting from %0)
|
|
* @info: info pointer to fill in (optional)
|
|
*
|
|
* If @fwnode is an ACPI device object, call %acpi_get_gpiod_by_index() for it.
|
|
* Otherwise (ie. it is a data-only non-device object), use the property-based
|
|
* GPIO lookup to get to the GPIO resource with the relevant information and use
|
|
* that to obtain the GPIO descriptor to return.
|
|
*/
|
|
struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode,
|
|
const char *propname, int index,
|
|
struct acpi_gpio_info *info)
|
|
{
|
|
struct acpi_gpio_lookup lookup;
|
|
struct acpi_device *adev;
|
|
int ret;
|
|
|
|
adev = to_acpi_device_node(fwnode);
|
|
if (adev)
|
|
return acpi_get_gpiod_by_index(adev, propname, index, info);
|
|
|
|
if (!is_acpi_data_node(fwnode))
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
if (!propname)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
memset(&lookup, 0, sizeof(lookup));
|
|
lookup.index = index;
|
|
|
|
ret = acpi_gpio_property_lookup(fwnode, propname, index, &lookup);
|
|
if (ret)
|
|
return ERR_PTR(ret);
|
|
|
|
ret = acpi_gpio_resource_lookup(&lookup, info);
|
|
return ret ? ERR_PTR(ret) : lookup.desc;
|
|
}
|
|
|
|
/**
|
|
* acpi_dev_gpio_irq_get() - Find GpioInt and translate it to Linux IRQ number
|
|
* @adev: pointer to a ACPI device to get IRQ from
|
|
* @index: index of GpioInt resource (starting from %0)
|
|
*
|
|
* If the device has one or more GpioInt resources, this function can be
|
|
* used to translate from the GPIO offset in the resource to the Linux IRQ
|
|
* number.
|
|
*
|
|
* The function is idempotent, though each time it runs it will configure GPIO
|
|
* pin direction according to the flags in GpioInt resource.
|
|
*
|
|
* Return: Linux IRQ number (> %0) on success, negative errno on failure.
|
|
*/
|
|
int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index)
|
|
{
|
|
int idx, i;
|
|
unsigned int irq_flags;
|
|
int ret;
|
|
|
|
for (i = 0, idx = 0; idx <= index; i++) {
|
|
struct acpi_gpio_info info;
|
|
struct gpio_desc *desc;
|
|
|
|
desc = acpi_get_gpiod_by_index(adev, NULL, i, &info);
|
|
|
|
/* Ignore -EPROBE_DEFER, it only matters if idx matches */
|
|
if (IS_ERR(desc) && PTR_ERR(desc) != -EPROBE_DEFER)
|
|
return PTR_ERR(desc);
|
|
|
|
if (info.gpioint && idx++ == index) {
|
|
char label[32];
|
|
int irq;
|
|
|
|
if (IS_ERR(desc))
|
|
return PTR_ERR(desc);
|
|
|
|
irq = gpiod_to_irq(desc);
|
|
if (irq < 0)
|
|
return irq;
|
|
|
|
snprintf(label, sizeof(label), "GpioInt() %d", index);
|
|
ret = gpiod_configure_flags(desc, label, 0, info.flags);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
irq_flags = acpi_dev_get_irq_type(info.triggering,
|
|
info.polarity);
|
|
|
|
/* Set type if specified and different than the current one */
|
|
if (irq_flags != IRQ_TYPE_NONE &&
|
|
irq_flags != irq_get_trigger_type(irq))
|
|
irq_set_irq_type(irq, irq_flags);
|
|
|
|
return irq;
|
|
}
|
|
|
|
}
|
|
return -ENOENT;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_get);
|
|
|
|
static acpi_status
|
|
acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
|
|
u32 bits, u64 *value, void *handler_context,
|
|
void *region_context)
|
|
{
|
|
struct acpi_gpio_chip *achip = region_context;
|
|
struct gpio_chip *chip = achip->chip;
|
|
struct acpi_resource_gpio *agpio;
|
|
struct acpi_resource *ares;
|
|
int pin_index = (int)address;
|
|
acpi_status status;
|
|
int length;
|
|
int i;
|
|
|
|
status = acpi_buffer_to_resource(achip->conn_info.connection,
|
|
achip->conn_info.length, &ares);
|
|
if (ACPI_FAILURE(status))
|
|
return status;
|
|
|
|
if (WARN_ON(ares->type != ACPI_RESOURCE_TYPE_GPIO)) {
|
|
ACPI_FREE(ares);
|
|
return AE_BAD_PARAMETER;
|
|
}
|
|
|
|
agpio = &ares->data.gpio;
|
|
|
|
if (WARN_ON(agpio->io_restriction == ACPI_IO_RESTRICT_INPUT &&
|
|
function == ACPI_WRITE)) {
|
|
ACPI_FREE(ares);
|
|
return AE_BAD_PARAMETER;
|
|
}
|
|
|
|
length = min(agpio->pin_table_length, (u16)(pin_index + bits));
|
|
for (i = pin_index; i < length; ++i) {
|
|
int pin = agpio->pin_table[i];
|
|
struct acpi_gpio_connection *conn;
|
|
struct gpio_desc *desc;
|
|
bool found;
|
|
|
|
mutex_lock(&achip->conn_lock);
|
|
|
|
found = false;
|
|
list_for_each_entry(conn, &achip->conns, node) {
|
|
if (conn->pin == pin) {
|
|
found = true;
|
|
desc = conn->desc;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* The same GPIO can be shared between operation region and
|
|
* event but only if the access here is ACPI_READ. In that
|
|
* case we "borrow" the event GPIO instead.
|
|
*/
|
|
if (!found && agpio->sharable == ACPI_SHARED &&
|
|
function == ACPI_READ) {
|
|
struct acpi_gpio_event *event;
|
|
|
|
list_for_each_entry(event, &achip->events, node) {
|
|
if (event->pin == pin) {
|
|
desc = event->desc;
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!found) {
|
|
enum gpiod_flags flags = acpi_gpio_to_gpiod_flags(agpio);
|
|
const char *label = "ACPI:OpRegion";
|
|
|
|
desc = gpiochip_request_own_desc(chip, pin, label,
|
|
flags);
|
|
if (IS_ERR(desc)) {
|
|
status = AE_ERROR;
|
|
mutex_unlock(&achip->conn_lock);
|
|
goto out;
|
|
}
|
|
|
|
conn = kzalloc(sizeof(*conn), GFP_KERNEL);
|
|
if (!conn) {
|
|
status = AE_NO_MEMORY;
|
|
gpiochip_free_own_desc(desc);
|
|
mutex_unlock(&achip->conn_lock);
|
|
goto out;
|
|
}
|
|
|
|
conn->pin = pin;
|
|
conn->desc = desc;
|
|
list_add_tail(&conn->node, &achip->conns);
|
|
}
|
|
|
|
mutex_unlock(&achip->conn_lock);
|
|
|
|
if (function == ACPI_WRITE)
|
|
gpiod_set_raw_value_cansleep(desc,
|
|
!!((1 << i) & *value));
|
|
else
|
|
*value |= (u64)gpiod_get_raw_value_cansleep(desc) << i;
|
|
}
|
|
|
|
out:
|
|
ACPI_FREE(ares);
|
|
return status;
|
|
}
|
|
|
|
static void acpi_gpiochip_request_regions(struct acpi_gpio_chip *achip)
|
|
{
|
|
struct gpio_chip *chip = achip->chip;
|
|
acpi_handle handle = ACPI_HANDLE(chip->parent);
|
|
acpi_status status;
|
|
|
|
INIT_LIST_HEAD(&achip->conns);
|
|
mutex_init(&achip->conn_lock);
|
|
status = acpi_install_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
|
|
acpi_gpio_adr_space_handler,
|
|
NULL, achip);
|
|
if (ACPI_FAILURE(status))
|
|
dev_err(chip->parent,
|
|
"Failed to install GPIO OpRegion handler\n");
|
|
}
|
|
|
|
static void acpi_gpiochip_free_regions(struct acpi_gpio_chip *achip)
|
|
{
|
|
struct gpio_chip *chip = achip->chip;
|
|
acpi_handle handle = ACPI_HANDLE(chip->parent);
|
|
struct acpi_gpio_connection *conn, *tmp;
|
|
acpi_status status;
|
|
|
|
status = acpi_remove_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
|
|
acpi_gpio_adr_space_handler);
|
|
if (ACPI_FAILURE(status)) {
|
|
dev_err(chip->parent,
|
|
"Failed to remove GPIO OpRegion handler\n");
|
|
return;
|
|
}
|
|
|
|
list_for_each_entry_safe_reverse(conn, tmp, &achip->conns, node) {
|
|
gpiochip_free_own_desc(conn->desc);
|
|
list_del(&conn->node);
|
|
kfree(conn);
|
|
}
|
|
}
|
|
|
|
static struct gpio_desc *acpi_gpiochip_parse_own_gpio(
|
|
struct acpi_gpio_chip *achip, struct fwnode_handle *fwnode,
|
|
const char **name, unsigned int *lflags, unsigned int *dflags)
|
|
{
|
|
struct gpio_chip *chip = achip->chip;
|
|
struct gpio_desc *desc;
|
|
u32 gpios[2];
|
|
int ret;
|
|
|
|
*lflags = 0;
|
|
*dflags = 0;
|
|
*name = NULL;
|
|
|
|
ret = fwnode_property_read_u32_array(fwnode, "gpios", gpios,
|
|
ARRAY_SIZE(gpios));
|
|
if (ret < 0)
|
|
return ERR_PTR(ret);
|
|
|
|
desc = gpiochip_get_desc(chip, gpios[0]);
|
|
if (IS_ERR(desc))
|
|
return desc;
|
|
|
|
if (gpios[1])
|
|
*lflags |= GPIO_ACTIVE_LOW;
|
|
|
|
if (fwnode_property_present(fwnode, "input"))
|
|
*dflags |= GPIOD_IN;
|
|
else if (fwnode_property_present(fwnode, "output-low"))
|
|
*dflags |= GPIOD_OUT_LOW;
|
|
else if (fwnode_property_present(fwnode, "output-high"))
|
|
*dflags |= GPIOD_OUT_HIGH;
|
|
else
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
fwnode_property_read_string(fwnode, "line-name", name);
|
|
|
|
return desc;
|
|
}
|
|
|
|
static void acpi_gpiochip_scan_gpios(struct acpi_gpio_chip *achip)
|
|
{
|
|
struct gpio_chip *chip = achip->chip;
|
|
struct fwnode_handle *fwnode;
|
|
|
|
device_for_each_child_node(chip->parent, fwnode) {
|
|
unsigned int lflags, dflags;
|
|
struct gpio_desc *desc;
|
|
const char *name;
|
|
int ret;
|
|
|
|
if (!fwnode_property_present(fwnode, "gpio-hog"))
|
|
continue;
|
|
|
|
desc = acpi_gpiochip_parse_own_gpio(achip, fwnode, &name,
|
|
&lflags, &dflags);
|
|
if (IS_ERR(desc))
|
|
continue;
|
|
|
|
ret = gpiod_hog(desc, name, lflags, dflags);
|
|
if (ret) {
|
|
dev_err(chip->parent, "Failed to hog GPIO\n");
|
|
fwnode_handle_put(fwnode);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
void acpi_gpiochip_add(struct gpio_chip *chip)
|
|
{
|
|
struct acpi_gpio_chip *acpi_gpio;
|
|
acpi_handle handle;
|
|
acpi_status status;
|
|
|
|
if (!chip || !chip->parent)
|
|
return;
|
|
|
|
handle = ACPI_HANDLE(chip->parent);
|
|
if (!handle)
|
|
return;
|
|
|
|
acpi_gpio = kzalloc(sizeof(*acpi_gpio), GFP_KERNEL);
|
|
if (!acpi_gpio) {
|
|
dev_err(chip->parent,
|
|
"Failed to allocate memory for ACPI GPIO chip\n");
|
|
return;
|
|
}
|
|
|
|
acpi_gpio->chip = chip;
|
|
INIT_LIST_HEAD(&acpi_gpio->events);
|
|
INIT_LIST_HEAD(&acpi_gpio->deferred_req_irqs_list_entry);
|
|
|
|
status = acpi_attach_data(handle, acpi_gpio_chip_dh, acpi_gpio);
|
|
if (ACPI_FAILURE(status)) {
|
|
dev_err(chip->parent, "Failed to attach ACPI GPIO chip\n");
|
|
kfree(acpi_gpio);
|
|
return;
|
|
}
|
|
|
|
if (!chip->names)
|
|
devprop_gpiochip_set_names(chip, dev_fwnode(chip->parent));
|
|
|
|
acpi_gpiochip_request_regions(acpi_gpio);
|
|
acpi_gpiochip_scan_gpios(acpi_gpio);
|
|
acpi_walk_dep_device_list(handle);
|
|
}
|
|
|
|
void acpi_gpiochip_remove(struct gpio_chip *chip)
|
|
{
|
|
struct acpi_gpio_chip *acpi_gpio;
|
|
acpi_handle handle;
|
|
acpi_status status;
|
|
|
|
if (!chip || !chip->parent)
|
|
return;
|
|
|
|
handle = ACPI_HANDLE(chip->parent);
|
|
if (!handle)
|
|
return;
|
|
|
|
status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
|
|
if (ACPI_FAILURE(status)) {
|
|
dev_warn(chip->parent, "Failed to retrieve ACPI GPIO chip\n");
|
|
return;
|
|
}
|
|
|
|
acpi_gpiochip_free_regions(acpi_gpio);
|
|
|
|
acpi_detach_data(handle, acpi_gpio_chip_dh);
|
|
kfree(acpi_gpio);
|
|
}
|
|
|
|
static int acpi_gpio_package_count(const union acpi_object *obj)
|
|
{
|
|
const union acpi_object *element = obj->package.elements;
|
|
const union acpi_object *end = element + obj->package.count;
|
|
unsigned int count = 0;
|
|
|
|
while (element < end) {
|
|
switch (element->type) {
|
|
case ACPI_TYPE_LOCAL_REFERENCE:
|
|
element += 3;
|
|
/* Fallthrough */
|
|
case ACPI_TYPE_INTEGER:
|
|
element++;
|
|
count++;
|
|
break;
|
|
|
|
default:
|
|
return -EPROTO;
|
|
}
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
static int acpi_find_gpio_count(struct acpi_resource *ares, void *data)
|
|
{
|
|
unsigned int *count = data;
|
|
|
|
if (ares->type == ACPI_RESOURCE_TYPE_GPIO)
|
|
*count += ares->data.gpio.pin_table_length;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* acpi_gpio_count - return the number of GPIOs associated with a
|
|
* device / function or -ENOENT if no GPIO has been
|
|
* assigned to the requested function.
|
|
* @dev: GPIO consumer, can be NULL for system-global GPIOs
|
|
* @con_id: function within the GPIO consumer
|
|
*/
|
|
int acpi_gpio_count(struct device *dev, const char *con_id)
|
|
{
|
|
struct acpi_device *adev = ACPI_COMPANION(dev);
|
|
const union acpi_object *obj;
|
|
const struct acpi_gpio_mapping *gm;
|
|
int count = -ENOENT;
|
|
int ret;
|
|
char propname[32];
|
|
unsigned int i;
|
|
|
|
/* Try first from _DSD */
|
|
for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
|
|
if (con_id)
|
|
snprintf(propname, sizeof(propname), "%s-%s",
|
|
con_id, gpio_suffixes[i]);
|
|
else
|
|
snprintf(propname, sizeof(propname), "%s",
|
|
gpio_suffixes[i]);
|
|
|
|
ret = acpi_dev_get_property(adev, propname, ACPI_TYPE_ANY,
|
|
&obj);
|
|
if (ret == 0) {
|
|
if (obj->type == ACPI_TYPE_LOCAL_REFERENCE)
|
|
count = 1;
|
|
else if (obj->type == ACPI_TYPE_PACKAGE)
|
|
count = acpi_gpio_package_count(obj);
|
|
} else if (adev->driver_gpios) {
|
|
for (gm = adev->driver_gpios; gm->name; gm++)
|
|
if (strcmp(propname, gm->name) == 0) {
|
|
count = gm->size;
|
|
break;
|
|
}
|
|
}
|
|
if (count > 0)
|
|
break;
|
|
}
|
|
|
|
/* Then from plain _CRS GPIOs */
|
|
if (count < 0) {
|
|
struct list_head resource_list;
|
|
unsigned int crs_count = 0;
|
|
|
|
if (!acpi_can_fallback_to_crs(adev, con_id))
|
|
return count;
|
|
|
|
INIT_LIST_HEAD(&resource_list);
|
|
acpi_dev_get_resources(adev, &resource_list,
|
|
acpi_find_gpio_count, &crs_count);
|
|
acpi_dev_free_resource_list(&resource_list);
|
|
if (crs_count > 0)
|
|
count = crs_count;
|
|
}
|
|
return count ? count : -ENOENT;
|
|
}
|
|
|
|
bool acpi_can_fallback_to_crs(struct acpi_device *adev, const char *con_id)
|
|
{
|
|
/* Never allow fallback if the device has properties */
|
|
if (acpi_dev_has_props(adev) || adev->driver_gpios)
|
|
return false;
|
|
|
|
return con_id == NULL;
|
|
}
|
|
|
|
/* Run deferred acpi_gpiochip_request_irqs() */
|
|
static int acpi_gpio_handle_deferred_request_irqs(void)
|
|
{
|
|
struct acpi_gpio_chip *acpi_gpio, *tmp;
|
|
|
|
mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
|
|
list_for_each_entry_safe(acpi_gpio, tmp,
|
|
&acpi_gpio_deferred_req_irqs_list,
|
|
deferred_req_irqs_list_entry)
|
|
acpi_gpiochip_request_irqs(acpi_gpio);
|
|
|
|
acpi_gpio_deferred_req_irqs_done = true;
|
|
mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);
|
|
|
|
return 0;
|
|
}
|
|
/* We must use _sync so that this runs after the first deferred_probe run */
|
|
late_initcall_sync(acpi_gpio_handle_deferred_request_irqs);
|